#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: lightblue;
}

.fyl-login {
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -115px;
    margin-left: -180px;
    width: 360px;
    height: 230px;
    background-color: #fff;
    padding: 20px;
}

.fyl-login .title {
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
    font-size: 25px;
    font-weight: bold;
}

.fyl-login .error-msg {
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -95px;
    margin-left: -180px;
}